30 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 60. 



The Maskell collection contains two slides of this species, both of 

 " adult female, 1892," and a strip of bark bearing a number of the 

 tests of the insect. From the latter it has been possible to obtain 

 mounts of the adult, cast skins believed to be of the second stage 

 female, and very young larvae, and the following description has 

 been prepared principally from these mounts. The unmounted ma- 

 terial bears No. 294. 



Before proceeding further it may be well to note that the previous 

 generic characterization is fundamentally wrong, in that the type 

 species possesses a well developed anal ring bearing six large and a 

 few smaller setae. 



Adult female. — Test and body about as figured and described by 

 Maskell; antennae reduced, of 6 segments; with three pairs of legs, 

 the two anterior pairs reduced, about half the size of the posterior 

 pair, and appearing more or less deformed ; all legs with few setae, 

 the tarsal claws short, the digitules apparently normal, slender, 

 knobbed, but usually injured, posterior tibia and tarsus nearly as 

 thick as femur; mentum apparently 1-segmented, no second segment 

 observed, short and broad conical; spiracles not unusual; without 

 anal lobes, these replaced by a group of large heavy spines, fringing 

 the dorsal area and standing above the anal ring, there being four 

 such spines close together in the middle, then a large seta on each 

 side, then about four more large spines; the region around the anal 

 ring and between it and the spines with numerous slender setae, 

 mostly small, but varying in length ; anal ring medium in size, cir- 

 cular, and very stout, set at the inner end of a short tube, with about 

 10 setae, of which six are larger than the remainder, the ring itself 

 with pores only in circles around the bases of these setae; no traces 

 of eyespots observed ; dorsum with a flattened circular area, bordered 

 by stout spines, in a single row continuous with those above the 

 anal ring posteriorly, but considerably smaller and several deep lat- 

 erally and anteriorly, and also scattered over the dorsal area ante- 

 riorly, this area crowded with " cells " of unknown function, but pos- 

 sibly glandular, these circular to irregularly oval in shape, very 

 close together in the center, somewhat more scattered around the 

 margin, mostly appearing as small tubercles or hemispherical nod- 

 ules, which are continued onto the sides in less completely developed 

 form; only one type of definitely developed gland pore noted, these 

 quinquelocular disk pores, occurring in transverse bands ventrally; 

 body with the stout spines already mentioned, these of two sorts, 

 acutely tapering and pointed on the posterior portion of the body and 

 much more bluntly pointed on the anterior portion ; in addition with 

 only slender, hairlike setae, varying considerably in size, a few scat- 

 tered through the circular dorsal area, others occurring rather thickly 

 ventrally, particularly in the abdominal region. 



